Radiation therapy utilization in Medicare beneficiaries with early-stage breast cancer.

In an older cohort of patients who otherwise would have qualified for the omission of radiation, two-thirds were treated with radiation. Future guideline recommendations should address omission in the context of hormonal blockade compliance because only 41% of the patients used hormonal blockade when radiation was not delivered. Cancer 2018;124:475-81. © 2017 American Cancer Society.